1) You have to know the exact user name.

2) Click this link: http://forums.d2jsp.org/pm.php?c=13

3) Then scroll down until you see this part:



4) Type in the user's name in the box marked red in the picture and then press the button marked blue. If an error message appears, you didn't get the exact user name.

5) The user is now added to your Address Book, it should look like this:



6) Click on the user's name in the red box, so that his/her profile appears. Mark and copy the part marked red in the following picture:



7) Then you can paste this link to wherever you want to. It will look like this: http://forums.d2jsp.org/user.php?i=193357, only the numbers will change for different users.